{"id":"CVE-2026-46300","aliases":[],"cve":{"records":[{"id":"CVE-2026-46300","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-05-13T15:03:33.111Z","published":"2026-05-23T11:44:02.231Z","modified":"2026-10-29T03:55:37.330Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-08-05T12:31:05.381Z"},{"name":"CVE","role":"ADP","organizationId":"af854a3a-2127-422b-91ae-364da2661108","modified":"2026-05-23T12:24:19.703Z"},{"name":"redhat-SADP","role":"ADP","organizationId":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","modified":"2026-09-01T12:04:48.173Z"},{"name":"siemens-SADP","role":"ADP","organizationId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","modified":"2026-10-15T01:21:27.626Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T03:55:37.330Z"}],"references":[{"url":"https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3","tags":[],"source":"Linux"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/13/5","tags":[],"source":"CVE"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/21/11","tags":[],"source":"CVE"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/21/12","tags":[],"source":"CVE"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/21/13","tags":[],"source":"CVE"},{"url":"https://access.redhat.com/security/cve/CVE-2026-46300","tags":["vdb-entry","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477015","tags":["issue-tracking","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46300.json","tags":["x_sadp-csaf-vex"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:19540","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:33486","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHBA-2026:20032","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:21695","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:21690","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:28887","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:23233","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:20087","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:25044","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:34098","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:21656","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:23245","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:21702","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:23240","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:20299","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:19569","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:19705","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:20593","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:20054","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:20129","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:19568","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:19666","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:23470","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:20130","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:20051","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:19521","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:23471","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:23469","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:24814","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:23468","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:19664","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:19711","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://access.redhat.com/errata/RHSA-2026:19875","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat-SADP"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","tags":[],"source":"siemens-SADP"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","tags":[],"source":"siemens-SADP"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-46300","tags":["government-resource"],"source":"CISA-ADP"}],"weaknesses":[{"id":"CWE-123","description":"Write-what-where Condition","source":"redhat-SADP"},{"id":"CWE-456","description":"CWE-456 Missing Initialization of a Variable","source":"CISA-ADP"}],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"5.10.257"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"5.15.208"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.1.174"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.6.141"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.12.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"7.1"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-05-14T00:00:00+00:00","decisions":[{"name":"Exploitation","value":"active"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"total"}]}]},"title":"net: skbuff: preserve shared-frag marker during coalescing","titleSource":"Linux","descriptionSource":"Linux","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: preserve shared-frag marker during coalescing\n\nskb_try_coalesce() can attach paged frags from @from to @to.  If @from\nhas SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same\nexternally-owned or page-cache-backed frags, but the shared-frag marker\nis currently lost.\n\nThat breaks the invariant relied on by later in-place writers.  In\nparticular, ESP input checks skb_has_shared_frag() before deciding\nwhether an uncloned nonlinear skb can skip skb_cow_data().  If TCP\nreceive coalescing has moved shared frags into an unmarked skb, ESP can\nsee skb_has_shared_frag() as false and decrypt in place over page-cache\nbacked frags.\n\nPropagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged\nfrags.  The tailroom copy path does not need the marker because it copies\nbytes into @to's linear data rather than transferring frag descriptors.","score":7.8,"severity":"high","published":"2026-05-23T11:44:02.231Z","modified":"2026-10-29T03:55:37.330Z","withdrawn":false,"knownExploited":true,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"cef401de7be8c4e155c6746bfccf721a4fa5fab9","status":"affected","lessThan":"3599e6b3cc1ada96883d496a50a210d3afbb6987","versionType":"git"},{"version":"cef401de7be8c4e155c6746bfccf721a4fa5fab9","status":"affected","lessThan":"2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c","versionType":"git"},{"version":"cef401de7be8c4e155c6746bfccf721a4fa5fab9","status":"affected","lessThan":"9d3e5fd19fe1063bf607219e8562fbd567b8e8d5","versionType":"git"},{"version":"cef401de7be8c4e155c6746bfccf721a4fa5fab9","status":"affected","lessThan":"78bf6b6bb19541d19fbda6242e7cfe2c682763c0","versionType":"git"},{"version":"cef401de7be8c4e155c6746bfccf721a4fa5fab9","status":"affected","lessThan":"760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e","versionType":"git"},{"version":"cef401de7be8c4e155c6746bfccf721a4fa5fab9","status":"affected","lessThan":"3bd9e113d50034db99d7ef69fd8e5242d15e414a","versionType":"git"},{"version":"cef401de7be8c4e155c6746bfccf721a4fa5fab9","status":"affected","lessThan":"3884358a9286b17f389a72b1426fc4547c23c111","versionType":"git"},{"version":"cef401de7be8c4e155c6746bfccf721a4fa5fab9","status":"affected","lessThan":"f84eca5817390257cef78013d0112481c503b4a3","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-46300"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"3.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.9","versionType":"semver"},{"version":"5.10.257","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.208","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.174","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-46300"},{"vendor":"Red 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Kernel Missing Initialization of a Variable Vulnerability","dateAdded":"2026-10-28","shortDescription":"Linux Kernel contains a missing initialization of a variable vulnerability that could allow for unintended modification of page-cache-backed data via failure to preserve the shared-fragment marker during socket buffer coalescing, causing ESP input processing to decrypt shared fragments in place. This vulnerability can be chained with CVE-2026-109618 and CVE-2026-109619 to implant PHP webshells and run commands as root.","requiredAction":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","dueDate":"2026-10-31","knownRansomwareCampaignUse":"Unknown","forensicTriage":"Yes","notes":"This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987 ; https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c ; https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 ; https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0 ; https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e ; https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a ; https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111 ; https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-46300","cwes":["CWE-456"]},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-28T21:45:31.438Z","attemptedAt":"2026-10-28T21:45:31.438Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-28T21:45:30.911Z","attemptedAt":"2026-10-28T21:45:30.911Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-28T21:45:31.439Z","attemptedAt":"2026-10-28T21:45:31.439Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-28T21:45:31.118Z","attemptedAt":"2026-10-28T21:45:31.118Z"}],"evidence":[{"source":"GitHub Advisory Database","id":"GHSA-47jg-vqrv-5f8v","url":"https://github.com/advisories/GHSA-47jg-vqrv-5f8v","modified":"2026-10-28T21:31:49Z","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","checkedAt":"2026-10-28T21:45:30.911Z"},{"source":"FIRST EPSS","id":"CVE-2026-46300","url":"https://www.first.org/epss/","probability":0.10192,"percentile":0.95651,"date":"2026-10-28","checkedAt":"2026-10-28T21:45:31.118Z"},{"source":"NVD","id":"CVE-2026-46300","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46300","modified":"2026-10-28T20:17:26.883","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","checkedAt":"2026-10-28T21:45:31.438Z"},{"source":"NVD","id":"CVE-2026-46300","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46300","modified":"2026-10-28T20:17:26.883","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","checkedAt":"2026-10-28T21:45:31.438Z"},{"source":"NVD","id":"CVE-2026-46300","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46300","modified":"2026-10-28T20:17:26.883","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","checkedAt":"2026-10-28T21:45:31.438Z"},{"source":"ENISA EUVD","id":"EUVD-2026-31535","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-31535","modified":"Oct 28, 2026, 7:59:23 PM","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","checkedAt":"2026-10-28T21:45:31.439Z"},{"source":"Exploit-DB","id":"52591","url":"https://www.exploit-db.com/exploits/52591","checkedAt":"2026-11-05T00:05:35.352Z"}],"aiSummary":null}